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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '293a7f2f4ba9f7ca2af9e2bf898ceefe8c6efe63fb80bd78264bed74aaf77e4e' 
  AND token = 'mBGwikNcDYcyu8w/OH8cVKGUq1VMBPnJ9ghFllTnTdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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