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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7e6fb3388149b06e4f8bf34296dcfd2ea8978e58a19f192d94dc002beea319c6' 
  AND token = 'JhvRCLalz1zYvR8h2Ex32lEUIlPkYOlNM30aBiyZuRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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