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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9fa3de9d44dbbbb2442039409b803df47c295a0eac2394bbfd2f414b7bd76e60' 
  AND token = 'RIHOW45t36gHCquL2MlCZZuz/NM+CUhPdc1RK08Ce4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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