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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2ecb86ea0a60e9d85ffa4d9320c76fad2bea1fb885ec3455cf7205ef6312fe4c' 
  AND token = 'VfygsT4w1HyLeKFhsxS525i9hfibZZyVpmoKohNV5Ig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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