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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '68a0f53fecad64847d44e65e6c92ea7ce0b0e6227df10316c9fd4e699d3bd62d' 
  AND token = 'd8CdyBlLeMLoVetqPhRffCjY01mDn99MJcd966gvFe4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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