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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b130f642eb092f5629f2043d7a91b1cec3a273db54e51c9d4223dfb5b33f444e' 
  AND token = 'z9CIFH+TofYJEk42yiGL+lT0PVxieN3avm+QhwkvSEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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