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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bc2d309ff4cc0562ca166bc9a0f290409aaace2bd4a7691ff2453da4a3e57fe2' 
  AND token = 'Ai94G+U3JjnqU6nnf6I3MoQkfB5uuv++3Hy+4vxr2wQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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