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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '966e913e4c82db4f7b40331dbc4a1c2529cbe76e44a6cc9d339d3897f4d8ea94' 
  AND token = 'CKkpC6rF/wXkqx704uITh63Te+eSEKnCpVGfrXjS2lE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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