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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f12e942cac1a1f5053095740a99d0c36ffe625dc2e365f1249b10e1d6518eb1d' 
  AND token = 'ayvrC9kQAnb76TmiOyLtBfgreytTpk5B3oSEszCh3VQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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