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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd2cdbd19274e5136770b6a4a1665909a104a0eac92cc1cd6da0e6a5a86030ca7' 
  AND token = 'GQm1dBvoWmukf86ZZ+Kn0wZJJB5okFDKhoVgcVkNe4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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