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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7e0ef34a5a18117155083234b6d7e805e270b8a6a54b23b76abc0f16511427d8' 
  AND token = 'NFa7koNT8yz4p96Xen94Ly68TSYPiosV9Ew6v5q5kgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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