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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '770d88feaf2e21be33ba72053ef433d97ac5416858255d5e27041fdec5ee70e8' 
  AND token = 'ssNtt3J/FFKNRLGBQc7Bs3FNLrGu/BfpAd6SeOyc4dQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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