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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c903142c773250413f80526d43a30dca45db3916e953c370efcd077ea42a1b02' 
  AND token = 'Jx+xPdPFjfqygMvPJvHQu665BxgHD42M4Eo3jixdHNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}