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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5e15d2a720a294ca22cb4acfc5bab08141a6cd3e691c1dbdbcbc8f8650f048a8' 
  AND token = '3TK/y9pMCeHocd5Io9bOHDqoIOPEFGQD7olAS3DIL6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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