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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '972ed2f8f2de12d14306359b99c83080576bb20899327aa23d9af2ee47922dfb' 
  AND token = '890Sc01s9I25X+Gs3QpDPx5H3HCVJRh5LY35lmUgvrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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